He's an expert in economics.

他是一位经济学专家。

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Mr. Samuels is an expert in macro economics.

塞谬尔斯先生是位宏观经济学专家。

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Dr Andrew Walker, an expert in health economics at Glasgow University, highlighted the problem in a report on hospital-acquired infections (HAIs).

BBC: Infections 'impacting' on NHS

According to the testimony, Brothers applied to be a "64, 000 Question" contestant as an expert in home economics and psychology.

WSJ: Popular psychologist Joyce Brothers dead at 85

But Stefan Szymanski, an expert in sports economics from the University of Michigan, told the BBC that even with the lower share price, Manchester United is still "the most valuable sports franchise in the world, and the American investors are looking at this as a franchise".

BBC: Manchester United lowers stock float value